While filing Income Tax Return, every person thinks about saving tax. Here, it is important to understand that tax cannot be saved in just one day, but for this you have to start planning well in advance. If you include these 7 allowances in your salary, then you will not need much investment to save tax. Only when you join a job, you should include all the allowances in your salary, so that you can get maximum benefit. You can also get your salary changed midway, for which you will have to talk to the HR of your company. Let us know about such allowances, which when included in your salary save you a lot of money.